When comparing Tribler vs WebTorrent Desktop, the Slant community recommends WebTorrent Desktop for most people. In the question“What are the best Torrent clients?”WebTorrent Desktop is ranked 7th while Tribler is ranked 13th. The most important reason people chose WebTorrent Desktop is:

Before the torrent is complete, you can stream the video and audio. It even supports seeking - it prioritizes the current location instead of always going in sequential order.
You can also stream to Chromecast, DLNA, and AirPlay.

Pros

Pro

No website needed to find torrents

Pro

Has a p2p search engine that can never be taken down

Pro

Free and ad-less

Tribler is free and completely ad-less.

Pro

Uses P2P onion routing to provide anonymity

Pro

Full-featured

Tribler covers basics such as Prioritization, Selective Downloading, DHT, PEX and Magnet URIs as well as Broadcatching and Search. It includes MSE/PE for security. It has graphical, web and command line interfaces. Has UPnP, NAT-PMP, NAT traversal for automatic router configuration. Has µTP data transfer protocol support. Even covers web seeding and embedded tracker. And it auto-updates.

Pro

Video-on-demand

Watch your videos while you download them.

Pro

Streaming supported

Before the torrent is complete, you can stream the video and audio. It even supports seeking - it prioritizes the current location instead of always going in sequential order.

Pro

Open Source

Pro

Beautiful interface

Pro

Support webrtc peers

It supports webrtc peers which increases the swarm to allow for websites to stream.

Cons

Con

Highly questionable developer competence

On December 2014, Yawning Angel did a casual code analysis and found a plethora of Tor protocol flaws and implementation issues calling in question their general quality assurance practices and code quality.

Con

Lacks IPv6 support

Con

No super-seeding

Super-seeding is an algorithm used to allow downloaders become uploaders quicker. Tribler lacks support for this functionality.

Con

No local peer discovery

Con

Files can't be downloaded sequentially

Sequential downloading can be used to stream media files such as video and audio while the download is still in progress. Transmission requires waiting until the complete file is downloaded before it's ready for use.

Con

No tracker exchange

Tracker exchange functionality allows peers to exchange information about trackers of a given file. It is another way of ensuring that the file is downloaded from the optimal source. Tribler lacks this functionality.